I think it’s a tech company. They employ lots of software engineers who develop a software product which is their central business. Why do you think it is not a tech company?
It’s sort of like saying Amazon is a delivery company. It’s part of a division of their company, and a main component at that. But it’s not like SREs working at AWS know or care about logistics.
I don't really understand the parallel. It's not like software engineers at Bloomberg really know or care all that much about finance. The vast majority just work on the software product that moves financial information.